[TriLUG] OT: thermodynamics of A/C question

[Steve Litt]

On Fri, 17 Aug 2012 9:36:47 -0400, jonc at nc.rr.com said:
> 
> Thanks for the follow up!
> 
> ---- Joseph Mack NA3T <jmack at wm7d.net> wrote:
> > 
> > I have a (calibrated) thermometer stuck on the outside of 
> > kitchen window, where it's in the shade all day. It's 10deg 
> > hotter there than a thermometer in the woods about 50ft 
> > away. I guess the physical structure of the house does get 
> > hot. The kitchen window thermometer was 110deg during the 
> > days of the heatwave.
> > 
> Very interesting... 
> 
> When I worked as a tech for the USDA we would use IR guns as spot
> thermometers. We noticed that the tree bodies were always 10 to 15
> degrees cooler than the open ground. It was more than just a shade
> effect - the trees used evaporative cooling during the hottest parts
> of the day.

Don't trees also convert the sun's radiation to nutrition for
themselves, and use energy to separate oxygen from carbon dioxide?

I've noticed that when I walk within 20 feet of a woods, the
temperature drops noticibly.


SteveT

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